Question

now we need to once again think about $delta h$. this is a review, and you might have to look back in your notes at chapter 6. select all correct statements. (check all that apply)
if a process requires energy, it is endothermic and the sign of $delta h$ is positive.
if a process requires energy, it is exothermic and the sign of $delta h$ is positive.
if a process releases energy, it is exothermic and the sign of $delta h$ is negative.
if a process releases energy, it is endothermic and the sign of $delta h$ is negative.

Explanation:

• Endothermic process: A process that requires energy (absorbs heat). By definition, for an endothermic process, $\Delta H>0$.
• Exothermic process: A process that releases energy (gives off heat). By definition, for an exothermic process, $\Delta H < 0$.

Answer:

• If a process requires energy, it is endothermic and the sign of $\Delta H$ is positive.
• If a process releases energy, it is exothermic and the sign of $\Delta H$ is negative.